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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d4e9be7605e052f71446dc245561c4cc4c3055e558ea5bfd9487d51a16ea37' 
  AND token = 'o8OngSHq/DKtcJbzj6CXGQxzqHkncOgILv+7Ycf4kl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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