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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cfd112ffc12f4eca375c49592afef6443abda55e123e301c2cdec9320c86d3' 
  AND token = 'YkfMNaBt0Dt9Y6umx2jT9c6Kkc/U+CGZcPFDcQhlRmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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