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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0fa1b8f79fb5ece3140e361ca7b422cbba2453c07ae533c6210b1d4a77f78b' 
  AND token = 'NdvZrgcyvEEFQ8U9Y0wuS+5hueAYYRNzu3qA3kVurxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}