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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7ee61e7642aab6d999c393bfd2206dcbd451b36d8a7ad7efb8f2af7d4c5d0b' 
  AND token = 'u0ytX9o8/Z7WsjKPimcYM6UMkQrPyE/BqGCd0c/QMvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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