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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1acd8ebd24c54686c04da22f80c3f7ea79365e5e6db904d76b4174a02f36018' 
  AND token = 'ApVhgLxd1XxGxAeOvJQp91+D5l+WH3ARUgLT8vUrfqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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