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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb9d3dc38d9347ef4eb5c92e6114afc8640091a06e69680f46f1ac2627b6984' 
  AND token = 'qXR5+PM/UqytfkfNSsy62Vr5gDXghLf63TNRc3fvDRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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