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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0175d647c9160bba7a887b9c09e004eda499aab89de589114826452d6a827b' 
  AND token = 'k7mm8I+4xQ9euML4MaXkb0EQ/oy3tgCyI8wbaswMBDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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