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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cee1440cc834e64b244301e588a335d6411d942771c14aa667b1f43754c7d29' 
  AND token = 'NHIixTHHWxKMz8em5T7yE+675DZOK8TSH8yKHv2Blt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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