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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08632f02dee310d69d98cd6dc8c13f5c9a16c82d820b40d0e1880736946e34db' 
  AND token = '4D7XYAiC/8C78lkN7dFtcWazdCgLFA7xdfMi03DHdCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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