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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9826e3b731d083ce0ef78e137e803381a1a167c55dd9bdba1be8631585b39e' 
  AND token = 'Ezt4o4YLS2Khv7eIs1bUOwUoiHmU9HiF4TDVBY9hU5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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