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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24800de0cd25ee7ad89790de47c479d024848670f0786706e8516d655e094142' 
  AND token = 'Ob9wk0jicQzqFoz/DJ43eJM6lXdDMBy0XEq6q8AAvTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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