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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc01d6215bb240db8e3cc759679c9ce0182cf5756c70b1e2500789a3ca943cd2' 
  AND token = 'mi6tyvs5zskVr6XFVkRoj6QQ7L3rFSOth7RBiBw17V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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