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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb54e6df3f3009447a06312c4f02e2ee5bf5f4028549e0737bc8dc6f1567f7ff' 
  AND token = 'Wp1xakmwNcDfZkh1CyE9ly6vikX9ct2ekVDp2fyeGHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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