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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64247128b63f57fb438cea0ca621975d4b7d4e6777016422541797dc7ddc78e' 
  AND token = 'f/iVO+iv5Bsbm6GrsRkEV9G/G+8aBvZGBvKLGkSwS+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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