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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3adca9c8e13ea2a8c59817f0075f514946253071ae7fdc956bd5dc96611756' 
  AND token = '6n3N2ozH5uI0UK75w9aaNoiyRBdOHPXbbHHkVjUyNlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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