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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce08429478013c2be810ea8c7967f1be5da8816ae3f1825af457161a1a17c23f' 
  AND token = '8XFs5ptlOkfYqTE+3HhMHp40CquQCjxus6ls2o43KOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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