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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d5ee5e7bb83508d622b94ac24aaa53897df29f058cada9d478b2d5e622c983' 
  AND token = '/2geelAiRGc1CjbQ6V7iHso9JHOe1bW9YLYMWNo5aKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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