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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5beb023c060225d84b13c9686991c39459bc68a4c97a5da22c7c3f678c0ec1a' 
  AND token = 'asukq3sJv9AacLepe9Sl5Vu/9h59ETUhgsviI/lquNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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