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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ec4b3d731fc8a19df3b3db35a6bd5a36f9dc6c4300d49e9a074fd97c6fd9fc' 
  AND token = 'ONI3dtDi1A5ociMrSuEl3lZYJUs3Q0jFU/wydk05+Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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