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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34168a421744b6d728b888b491541d2701561e4c0ad4378684692cc64f93eb1c' 
  AND token = 'OpBT30kcnJr26H8scEPFU7K2fCbv6ZAiGprDeg3bKzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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