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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd77655a96aef328cf3b095e41f599ba9fbda7b9a6450b31b8138e4afa682ed' 
  AND token = 'gP6vvR1D9H+bEE4vp/gxJy+9ooaHKuHnQlHw/Rlqgvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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