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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fd61cc05c8917c21105ebccac8bb0faa98bd695be265ce1ba876a1d48b77a2' 
  AND token = 'Tmr8saurptRxfT2Al2VQRSlmIz613REDgE7N7HwXtU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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