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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a36a8ce9632814fbc5f2ea0350a842af356eaf7dc967477c54be08418fd57b3' 
  AND token = 'ByyGq7u1nt+I9s4F2zI5aKFCed0DWxLFpv0fFf4DFSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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