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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27eb53fb85e2d7599cc6a62539565f028ffe0c464ccdc50778e2d37b8b8b86d6' 
  AND token = '16X803pb8hmlgn8NnbTo76e0kG7zCdBa2v+pvSZ/kv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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