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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b836766dbbb1d44a8483bca60196f177f594434284b8e54f7c1b8a98fc51f2c' 
  AND token = 'GkdYiZtzS/oWYkAO3VlZc8cVQYU67uMs7/shOgtAtjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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