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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd9f2e2e437b6b8d7315d6fc5012e87dc1984064e16f12b434ec563b69a44bd' 
  AND token = 'Q3CzY/lo8D5j8DJzQ40nJwE75pJRr2xppNpYGc8qgaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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