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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f82eed7ff0488a9a7e9f3e3c8705dc84e572f9a33c9d786c5556f1f95e7ebb' 
  AND token = 'b/OLIqydcQx9YuO8IdxakVt6L3UwOm3f2XNYMT6lE9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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