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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9d0353f5bb3f1ff1aa0c0cc580ed70bf852aa038e2db1242c2c1bf54834335' 
  AND token = '+bPXkx/SmVfqfOxZ0k+ktA0YXJQMkSUXqDJkjVlM++4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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