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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae7cdbcbdf8b59ed34a2bee18ebfc4276a9d8a93b1d39e76301201d34efe05f' 
  AND token = 'ASdmSF2bh+5MvuJQAEDMqB1niXIqTMnHYgzzqEj4Wi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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