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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbed416545ace7d444ef389b44a1d6abaf805d385839e65ae06093eadccfaa5c' 
  AND token = '9LtnWwVaT2iVN01NwsHKUrC2IP6twf4ZHiXbsbGUNQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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