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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a329edf0b45983d1252d6d182944dc2363890d7dbc1ea2bb18fd0f56f2f96d10' 
  AND token = '9J9kFwKx2//OduAfHF+6lHYG9mSvRQq+taUTE/cfDNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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