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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239858aebaa253206307d807fbd5fbc3ca1fe570605d4b40caab8c9348649b20' 
  AND token = '94aLczdyu52QITf2TnQmJHCi/ar/1Vk6cM0IO1S/EbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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