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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034b617d769e222f98737ff39a8c3f5036e2c64ac3f38eb079d8c64771a2bf6e' 
  AND token = 'G2LUuLwo/7K0Zbagew8SBRQbxKt7Ucr36p+Av+eBatM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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