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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7d0065d63c97a3946746614a5effc7d9e2daf8cb8cc31c12144e084cff48ef' 
  AND token = 'qzsGVNjVhAerxbI8jWvORyg9hy7GVj4Amd4yTzy6370=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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