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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038a4d4693c7a1b5cf5ec4e99788dce141f208ebd7290b7e3b4d6d75a1c6a417' 
  AND token = 'A9JZ+qOed9LzGEx8zKS/ycYiRLINlhAz6qFKIIiX/F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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