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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1686314c36654cc1741ab8cc22d537e1b6beac3e5050fc0a8bef6f25ebae3c6e' 
  AND token = '5VJslBAbIpFQnHPuNrz/vxzNrttekV5ake2qfAcTmKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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