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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821018abf6ee6b4bc9e0ef7fc4e59a4b7deb57069fa2a8fc50801b944ca05de3' 
  AND token = '5vkmQhbtJukwgeD1/Nw+c+1GTaNfgMl6S3GO5K8jyr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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