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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606a76e633c245e6b6e8924f55e1a2c2dc1bba9e6e0dcd1137c1fe5f0ad7f431' 
  AND token = 'sbaF/YmeGEuPueDsxbhy1QMlyMPm253qA2FxnhPdo7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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