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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f3fb63cc602a986f92a472894de206b4b86e56c1b6a810cd5e7d7669692368' 
  AND token = 'nm88OqrQXwSUulRlt+iV6ONHPrLrhJl7tI0RFQEDXfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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