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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c97306fb22481961239a87f385627ba6bbb9008e2bb27bbe8870673439382c' 
  AND token = 'JrZTFSCn3hKqZrBji0BQ1ybOvjxgsT7Ni6VulFuk748=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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