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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7b788aea4d1d2ad8206ccdbd84a68b64c1a3dbde15c0633897c6f93ac73ca3' 
  AND token = 'WLatkKwaMU3KPky6n/Jb2cyD/ct5bOlC7+V5wXgJZeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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