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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70578c72b6e7c190593a1f074f7806f750e470ee6eca20dcfbbb383a5ee9f5fd' 
  AND token = 'YZxUSlE5s7myczopNWEBMiS0cWrE/H7iSHq0lm8FyEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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