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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dad450528771bfab299824da6560ba61f07ee5662e2001f7a7eae8c2e66c8d' 
  AND token = '33bGXXaiPupb1jESGhnz4T2Nv5XzLpOM9s6JFPvc8XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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