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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce5d26e7b767746076b275f00d345beffc4c1ae6c3e9d315d7c61aa42aebff1' 
  AND token = 'W9nieQFHY/1AdIGP/mzzUml00Bj9ZDGYaUoJPoev32A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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