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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e0431078bd9270dfb6c87653cf1d53c721e1a7dfa4300cd20ba68ac2fe6478' 
  AND token = 'nru/TZKxJ00u6OnzBLrCdyrTUBmqzYf1/pqAQxaOLMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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