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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be72a536d156be51369291112872e9b2ddfd91434896cc3c49784ac916e45b41' 
  AND token = 'A7gFSYFu6THuO/rJ35QnvfNj49F31bz584yQ+9Tjgpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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