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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05adb33d7d693ae4f5c92741505ae050c97219cba45ecfb7ec4a74c3151238b4' 
  AND token = 'ukewOGQ5ymgmMLOO4dXUs+NzK7GImZjrqwncbtVcXsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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