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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa62bf5d8ab9ae35a9694ad40399ebbc86efb7ed9427c8e9c29ecd51dc24cf7' 
  AND token = '3CGVzSP7ubua34CS4OgdTq4+5vacXJlL6QtUVxiAxKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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