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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f3c570e0cf195bdce50594db7417a738e9a5b7a29e74fbf35dc8cbed135bb7' 
  AND token = 'g4YfRsK+ZgjdVOgnVmzaIwcvmpkB+STeNwsjzPb50QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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