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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4af791c8894028fa18151739fb7b7a2f5b89e53e0fbdf8a95bdf492b9b520c' 
  AND token = 'rlh2AHFGtuLCfSbUQECFDUCen9AQEt0zR7k8L4m+Qm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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