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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1e538bbd484bd38b9ec1fbab384e1548e7ac2aaae1be68432b6dcad9bd9c9a' 
  AND token = 'wZIB/AzI05M1C9O2rWk2JpaseCbhKufDtrKY3VmyL70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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