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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938e2934bd97db5197b073a3e54cc0fd3d6d072d2828c5b99f25db6ce6234e22' 
  AND token = 'K8/ByITZ0dg1H6QzLUrx1T+r60V9fxCJjXqSs/M36Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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