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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff98d460ac07ade4ea734d65c41f5259ad98a7630f256b67cc44284b57f320f' 
  AND token = '4UmLOcGldGGDzmrJ2g3FeR6SvFkTwtl7x5TJdMxSz3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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