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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bfb47f3dde220e3b7fc28e3d0dcf926d1b1a1ec613b5c92e08c33a93e6f4e5' 
  AND token = 'SA07KplfN00K3hJ88sbyjUMK/mq7/TTXptboKkmrVQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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