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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaec2eece761a45922678dcbb904a452f47ae2d2c4306affe0404da744ed7bcb' 
  AND token = '8OgQPDZLc17SD4Pqr8bHHhMuTv5drOYU8yvGpOGzNyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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