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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4953a49e1c0d0679f9dd78104749f999ab5650920e945028d701886d4a19dbea' 
  AND token = '3hMJFGWV7UkBwHsk9Nk07NH/8J/TMG+9TPgHImGNaiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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