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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b17cfa4c1b3db90c90c1ff1efc40ea3519e7c23edad4ba776a5f0ce4d8bed94' 
  AND token = 'Cc+Izl71cWphYu99aHlMiIwJTTyTdZmKQEPBfIJNxLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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