SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3021995938c8443f78bb402455b07c20cffa148c2563762f7d01869ed45a7173' 
  AND token = 'aMlNwSnjoqrBpjc3rkIY+BxhtiWRKOV5p4lZb85igEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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