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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e79fcdc1fb1a61de42fc00a3dca81006e112ff8393ac429d5edcda5d2ce6fab' 
  AND token = '/ia0VPIaKm+eC9CAxWk+2DJ4kUAjXwqx/9mC5dv7sko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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