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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c131a400afc00cdfc059d030c6ae9c86db78f2c157909edeeb32ea7c6797cfee' 
  AND token = 'MBctDBxrQP38ivUWDQNUxWTp3DDDBrm4vflnRb46+d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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