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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a756126d002c85dbae6e2da1014b040a04c7c468adcf2380eac6b059f6bc81bd' 
  AND token = 'a8gph917Z4Lv0XxWlHIe2FG3VpFLWJAqrhEH8g2Qyy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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