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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f978c38ea5a1a8f5ca4215cd5fd65e2358e44a03ee934acf700b2cc109b6bb9' 
  AND token = 'mPk+dxA87ZxS9sLcVB+8GpNI01kKCzpMhwDEuTZbkos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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