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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9992dc83d2439db84d524b5ddf7698523f137c0adfbbe9d809d90193c20743c4' 
  AND token = 'A1MKKPqxoxrf6/yJSyZvPXFby2cFlWtUUYRBNIcf3gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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