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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0580d84850e203b08acbd97e21ff545671ee5f3a86ad6f053ec5d53401580f' 
  AND token = 'dPPFKq28pdZlZDpjwWirHo+nZN2b2LtyGJmeKSZG07E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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