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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6fa773f6d9173fa3cf74de8b82b8ca4525e7b8de61a018e35d499879b3d1fb' 
  AND token = 'Z5anQObO32W7CLvEQDuNzJz18KlQSmaUWSR3dI/1rWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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