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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d2fb1dea1d7f0d5b3f90b7ef75fe72d8c4890174f76a852f0553fc027b9d2f' 
  AND token = 'r7pofMder5wE9/WwYo5XS5ccEmbzSxT02VIB7Hiwb5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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